Abstract:
Sulfur compound in waste water is poisonous and smells badly when it is discharged into public
surface water. Due to a large amount of oxygen needed. oxygen in water will reduce quickly.
Sulfur compound should be treated before discharging. The objective of this research was to study
the effect of sulfide concentration in sulfide oxidation using a 5-litre USB reactor and acclimatized
bacteria. The experiment was conducted in 3 conditions, i.e. (l) Reaeter No. 1 with sulfide
concentration at 306 mg/l., (2) Reactor No.2 with sulfide concentration at 482 mg/L and (3)
Reactor No. 3 with sulfide concentration at 642 mg/L. By comparing the efficiency in sulfide
removal, it showed that at the sulfide loading rate of 1,000 mgS./L.d all three reactors could be used
to remove sulfide at the efficiency of 95, 91 and 88 percent, respectively. The results showed that
the efficiency to remove sulfide decreased when the concentration of wastewater increased.